/*
 * Copyright (C) 2011 Sergey Margaritov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fr.gdi.android.news.preference.color;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Color;
import android.preference.Preference;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

/**
 * A preference type that allows a user to choose a time
 * 
 * @author Sergey Margaritov
 */
public class ColorPickerPreference extends Preference implements Preference.OnPreferenceClickListener, ColorPickerDialog.OnColorChangedListener
{
    
    private static final String ZERO = "0"; //$NON-NLS-1$
    private static final String SHARP = "#"; //$NON-NLS-1$
    View mView;
    int mDefaultValue = Color.BLACK;
    private int mValue = Color.BLACK;
    private float mDensity = 0;
    private boolean mAlphaSliderEnabled = false;
    
    private static final String androidns = "http://schemas.android.com/apk/res/android"; //$NON-NLS-1$
    
    public ColorPickerPreference(Context context)
    {
        super(context);
        init(context, null);
    }
    
    public ColorPickerPreference(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init(context, attrs);
    }
    
    public ColorPickerPreference(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        init(context, attrs);
    }
    
    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue)
    {
        onColorChanged(restoreValue ? getValue() : (Integer) defaultValue);
    }
    
    private void init(Context context, AttributeSet attrs)
    {
        mDensity = getContext().getResources().getDisplayMetrics().density;
        setOnPreferenceClickListener(this);
        if (attrs != null)
        {
            String defaultValue = attrs.getAttributeValue(androidns, "defaultValue"); //$NON-NLS-1$
            if (!TextUtils.isEmpty(defaultValue) && defaultValue.startsWith(SHARP))
            {
                try
                {
                    mDefaultValue = convertToColorInt(defaultValue);
                }
                catch (NumberFormatException e)
                {
                    Log.e("ColorPickerPreference", "Wrong color: " + defaultValue); //$NON-NLS-1$ //$NON-NLS-2$
                    mDefaultValue = convertToColorInt("#FF000000"); //$NON-NLS-1$
                }
            }
            else
            {
                int resourceId = attrs.getAttributeResourceValue(androidns, "defaultValue", 0); //$NON-NLS-1$
                if (resourceId != 0)
                {
                    mDefaultValue = context.getResources().getInteger(resourceId);
                }
            }
            mAlphaSliderEnabled = attrs.getAttributeBooleanValue(null, "alphaSlider", false); //$NON-NLS-1$
        }
        mValue = mDefaultValue;
    }
    
    @Override
    protected void onBindView(View view)
    {
        super.onBindView(view);
        mView = view;
        setPreviewColor();
    }
    
    private void setPreviewColor()
    {
        if (mView == null) return;
        ImageView iView = new ImageView(getContext());
        LinearLayout widgetFrameView = ((LinearLayout) mView.findViewById(android.R.id.widget_frame));
        if (widgetFrameView == null) return;
        widgetFrameView.setVisibility(View.VISIBLE);
        widgetFrameView.setPadding(widgetFrameView.getPaddingLeft(), widgetFrameView.getPaddingTop(), (int) (mDensity * 8), widgetFrameView.getPaddingBottom());
        // remove already create preview image
        int count = widgetFrameView.getChildCount();
        if (count > 0)
        {
            widgetFrameView.removeViews(0, count);
        }
        widgetFrameView.addView(iView);
        iView.setBackgroundDrawable(new AlphaPatternDrawable((int) (5 * mDensity)));
        iView.setImageBitmap(getPreviewBitmap());
    }
    
    private Bitmap getPreviewBitmap()
    {
        int d = (int) (mDensity * 31); // 30dip
        int color = getValue();
        Bitmap bm = Bitmap.createBitmap(d, d, Config.ARGB_8888);
        int w = bm.getWidth();
        int h = bm.getHeight();
        int c = color;
        for (int i = 0; i < w; i++)
        {
            for (int j = i; j < h; j++)
            {
                c = (i <= 1 || j <= 1 || i >= w - 2 || j >= h - 2) ? Color.GRAY : color;
                bm.setPixel(i, j, c);
                if (i != j)
                {
                    bm.setPixel(j, i, c);
                }
            }
        }
        
        return bm;
    }
    
    public int getValue()
    {
        try
        {
            if (isPersistent())
            {
                mValue = getPersistedInt(mDefaultValue);
            }
        }
        catch (ClassCastException e)
        {
            mValue = mDefaultValue;
        }
        
        return mValue;
    }
    
    @Override
    public void onColorChanged(int color)
    {
        if (isPersistent())
        {
            persistInt(color);
        }
        mValue = color;
        setPreviewColor();
        try
        {
            getOnPreferenceChangeListener().onPreferenceChange(this, color);
        }
        catch (NullPointerException e)
        {
            
        }
    }
    
    public boolean onPreferenceClick(Preference preference)
    {
        ColorPickerDialog picker = new ColorPickerDialog(getContext(), getValue());
        picker.setOnColorChangedListener(this);
        if (mAlphaSliderEnabled)
        {
            picker.setAlphaSliderVisible(true);
        }
        picker.show();
        
        return false;
    }
    
    /**
     * Toggle Alpha Slider visibility (by default it's disabled)
     * 
     * @param enable
     */
    public void setAlphaSliderEnabled(boolean enable)
    {
        mAlphaSliderEnabled = enable;
    }
    
    /**
     * For custom purposes. Not used by ColorPickerPreferrence
     * 
     * @param color
     * @author Unknown
     */
    public static String convertToARGB(int color)
    {
        String alpha = Integer.toHexString(Color.alpha(color));
        String red = Integer.toHexString(Color.red(color));
        String green = Integer.toHexString(Color.green(color));
        String blue = Integer.toHexString(Color.blue(color));
        
        if (alpha.length() == 1)
        {
            alpha = ZERO + alpha;
        }
        
        if (red.length() == 1)
        {
            red = ZERO + red;
        }
        
        if (green.length() == 1)
        {
            green = ZERO + green;
        }
        
        if (blue.length() == 1)
        {
            blue = ZERO + blue;
        }
        
        return SHARP + alpha + red + green + blue;
    }
    
    /**
     * For custom purposes. Not used by ColorPickerPreferrence
     * 
     * @param argb
     * @throws NumberFormatException
     * @author Unknown
     */
    public static int convertToColorInt(String argb) throws NumberFormatException
    {
        
        if (argb.startsWith(SHARP))
        {
            argb = argb.replace(SHARP, ""); //$NON-NLS-1$
        }
        
        int alpha = -1, red = -1, green = -1, blue = -1;
        
        if (argb.length() == 8)
        {
            alpha = Integer.parseInt(argb.substring(0, 2), 16);
            red = Integer.parseInt(argb.substring(2, 4), 16);
            green = Integer.parseInt(argb.substring(4, 6), 16);
            blue = Integer.parseInt(argb.substring(6, 8), 16);
        }
        else if (argb.length() == 6)
        {
            alpha = 255;
            red = Integer.parseInt(argb.substring(0, 2), 16);
            green = Integer.parseInt(argb.substring(2, 4), 16);
            blue = Integer.parseInt(argb.substring(4, 6), 16);
        }
        
        return Color.argb(alpha, red, green, blue);
    }
    
    public void setValue(int v)
    {
        mValue = v;
    }
    
}